test: extract headers

Author: billyyyyy3320

packages/@vuepress/core/lib/node/__tests__/prepare/Page.spec.js

@@ -121,6 +121,23 @@ describe('markdown page', () => {
 
     expect(page.excerpt).toMatchSnapshot()
   })
+
+  test('should extract level 2 and 3 headers by default', async () => {
+    const { relative, filePath } = getDocument('alpha.md')
+    const markdown = getMarkdown()
+    const page = await setupPage({ filePath, relative }, { markdown })
+
+    expect(page.headers).toMatchSnapshot()
+  })
+
+  test('should extract headers by config', async () => {
+    const { relative, filePath } = getDocument('alpha.md')
+    const markdown = getMarkdown()
+    const extractHeaders = ['h1', 'h2']
+    const page = await setupPage({ filePath, relative, extractHeaders }, { markdown })
+
+    expect(page.headers).toMatchSnapshot()
+  })
 })
 
 describe('title', () => {
@@ -259,5 +276,4 @@ describe('public api', () => {
 // TODO I18n
 // TODO Add a page with explicit content
 // TODO SFC
-// TODO Headers
 

packages/@vuepress/core/lib/node/__tests__/prepare/__snapshots__/Page.spec.js.snap

@@ -4,3 +4,33 @@ exports[`markdown page should extract any content above <!-- more --> as excerpt
 <h1 id="excerpt"><a class="header-anchor" href="#excerpt" aria-hidden="true">#</a> Excerpt</h1>
 <p>Blablabla...</p>
 `;
+
+exports[`markdown page should extract headers by config 1`] = `
+Array [
+  Object {
+    "level": 1,
+    "slug": "alpha",
+    "title": "Alpha",
+  },
+  Object {
+    "level": 2,
+    "slug": "h2",
+    "title": "h2",
+  },
+]
+`;
+
+exports[`markdown page should extract level 2 and 3 headers by default 1`] = `
+Array [
+  Object {
+    "level": 2,
+    "slug": "h2",
+    "title": "h2",
+  },
+  Object {
+    "level": 3,
+    "slug": "h3",
+    "title": "h3",
+  },
+]
+`;

packages/@vuepress/core/lib/node/__tests__/prepare/fixtures/docs/alpha.md

@@ -3,3 +3,7 @@ title: VuePress Alpha
 ---
 
 # Alpha
+
+## h2
+
+### h3